GFork

Nice script!

One note though, the variable ele is not used!

const startObserver = () => {
    observer = new MutationObserver(checkAndInject);
    const ele = document.querySelector('[role="tabpanel"]') || document.body;
    // observer.observe(document.body, config.observerOptions);
    observer.observe(ele, config.observerOptions);
};

Thanks for your feedback! I've removed the unused variable.